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The ALi chipset makes only one hardware ID available for the Audio Codec '97 (AC '97) controller. The available hardware ID is for audio. The audio driver( sound card driver) also enumerates a child node for the modem. SP1 updates the audio node, which causes the issue for the winmodem device.

The solution

Method 1: Use the Roll Back Driver Feature for the Audio Node

1. Right-click My Computer, and then click Properties.
2. Click the Hardware tab, and then click Device Manager.
3. Expand Modems, and then double-click the audio node for your modem.
4. Click the Driver tab, and then click Roll Back Driver.

Method 2: Edit the Ltsmwxp.inf File and Update the Driver Edit the Ltsmwxp.inf file

1. Click Start, and then click Search.
2. Click All files and folders.
3. In the All or part of the file name box, type ltsmwxp.inf, and then click Search.
4. In the Search Results window, double-click Ltsmwxp.inf.
5. On the File Menu, click Save As, and save the file as Ltsmwxp.old.
6. Find the following line in the file:
   %ALI_AMR.Modem% = ALI_AMR.Modem, PCI\VEN_10B9&DEV_5450&SUBSYS_4C275349
7. After this line, add the following:%ALI_AMR.Modem% = ALI_AMR.Modem, {be20ddbf-3fb3-4add-a5c0-49be7ac20fb}\VEN_10B9&DEV_5450&SUBSYS_4C275349
   
8. On the File menu, click Save As, and save the file as Ltsmwxp.inf.
9. Note the location of this file, and then quit Notepad.

Update the Driver

1. Right-click My Computer, and then click Properties.
2. Click the Hardware tab, and then click Device Manager.
3. Expand Modems, and then double-click the audio node for your modem.
4. Click the Driver tab, and then click Update Driver.
5. In the Hardware Update Wizard, click Install from a list or specified location (Advanced), and then specify the location of the Ltsmwxp.inf file.